Easily identifiable as an adult.

Overwinters as a larva for two years, the first one-and-a-half years in a small pistol-case, and in the second spring building a long straight case.

Recorded in 24 (8.9%) of the 270 2km squares of Huntingdonshire.

Last recorded in August 2019

Recorded date range (Adult): 15 June to 10 August

Recorded date range (Larva/Leafmine): 14 June to 10 October